Those knobs being on the left = sometimes a user'd make a go at the charging handle with their left hand, and would catch a knob on the TA51. The solution was to detach, rotate and reinstall the TA51, because those knobs being on the right didn't interfere with anything.
The Corps fielded the RCO before the Army did, and made the request that they be installed with knobs on the right. Some of the fieldings/NET we did included rotating those mounts until they started coming from Trijicon in the requested configuration.
Contractor scum, PM Infantry Weapons
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